In a class there are 8, 10, 25 and 17 students having weights in the ranges 50-54 kg, 54-58 kg, 58-62 kg and 62-66 kg respectively. What is the mean weight of a student of the class?
A55.6 kg
B56.5 kg
C59.4 kg ✓ Correct
D60.2 kg
Correct answer: (C) 59.4 kg
Explanation
The mean weight is 59.4 kg.
Use class midpoints 52, 56, 60, 64 kg.
Sum = 52x8 + 56x10 + 60x25 + 64x17 = 3564.
Total students = 8 + 10 + 25 + 17 = 60.
Mean = 3564 / 60 = 59.4 kg.
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